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Hong Kong became a British colony after the Treaty of Nanking in 1842, the result of the Opium War. This was a particularly shameful episode, even by the standards of 19th-century imperialism. The growing British taste for tea had created a huge trade deficit with China. In a desperate attempt to plug the gap, Britain started exporting opium produced in India to China. The mere detail that selling opium was illegal in China could not possibly be allowed to obstruct the noble cause of balancing the books. When a Chinese official seized an illicit cargo of opium in 1841, the British government used it as an excuse to fix the problem once and for all by declaring war. China was heavily defeated in the war and forced to sign the Treaty of Nanking, which made China 'lease' Hong Kong to Britain and give up its right to set its own tariffs.
So there it was-the self-proclaimed leader of the 'liberal' world declaring war on another country because the latter was getting in the way of its illegal trade in narcotics. The truth is that the free movement of goods, people, and money that developed under British hegemony between 1870 and 1913-the first episode of globalization-was made possible, in large part, by military might, rather than market forces. Apart from Britain itself, the practitioners of free trade during this period were mostly weaker countries that had been forced into, rather than had voluntarily adopted, it as a result of colonial rule or 'unequal treaties' (like the Nanking Treaty), which, among other things, deprived them of the right to set tariffs and imposed externally determined low, flat-rate tariffs (3-5%) on them.
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Ha-Joon Chang (Bad Samaritans: The Myth of Free Trade and the Secret History of Capitalism)